Figure 4. The Mach cone appears in a computer model of a supershear rupture (top panel), accompanied by much higher ground motion (which is plotted here), ground shaking, and shear stress, than in a more typical sub-shear rupture (bottom panel). Notice that the color scale is almost twice as high in the supershear panel; if the color scales were the same, the difference between them would be even more dramatic. Figures annotated from Dunham and Archuleta (2005)